[Boatanchors] Choke voltage rating

[Al Parker]

Hi Vic,
    I'd put some heat under the choke for a day or 3 to make sure it's
completely dried out.  The "sealed" case probably isn't vapor tight now,
if it ever was.  Then you can put some HV on it & check for leakage to the
case.  If you can get up to 900-1000vdc across it with <0.1ma current,
you've got a pretty safe bet, with 9 to 10 megs leakage.  Just using an
ohmeter won't give you a proper reading, you need the volatge across it.
Of course, if you can put 150% of your wkg voltage on it with low leakage,
that's even a more sure bet.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info


----- Original Message ----- 
From: "Vic Rosenthal" <vic at rakefet.com>
To: "Boatanchors list" <boatanchors at mailman.qth.net>
Sent: Monday, January 24, 2005 1:19 PM
Subject: [Boatanchors] Choke voltage rating


> I guess I'm asking for reassurance, but:
>
> I have a choke marked Milwaukee Transformer Co. (various numbers), 4 Hy
@ 160 MA
> DC, ... WV 500.  It's encapsulated in a nice steel box and also marked
"MIL-T-27
> Grade 1 Class A"  Obviously potted and the case looks soldered shut.
Porcelain
> terminals.
>
> It's probably OK to operate this choke in true ham spirit in a 750 volt
supply,
> right?  The case will be well grounded so the worst thing that can
happen will
> be a blown fuse.
>
> On the other hand, maybe someone will say "no, you really have to
believe the
> voltage ratings on this kind of stuff!"
>
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
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